package com.aliyun.messagemgt.util.thread;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * 线程池配置文件
 * @author byp
 * @date 2020/1/14
 */
@Configuration
@EnableAsync
public class ThreadPoolExecutorConfig {

    private int corePoolSize = 5;
    private int maxPoolSize = 100;
    private int queueCapacity = 200;
    private int aliveSeconds = 300;
    private String namePrefix = "async-service-";

    private static Logger logger = LoggerFactory.getLogger(ThreadPoolExecutorConfig.class);
    /**
     * 异步线程池
     */
    @Bean("asyncServiceExecutor")
    public ThreadPoolTaskExecutor executor() {
        logger.info("start asyncServiceExecutor");
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        //配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);
        // 允许线程空闲时间
        executor.setKeepAliveSeconds(aliveSeconds);
        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        //执行初始化
        executor.initialize();
        return executor;
    }
}
